21002224169 has 2 divisors, whose sum is σ = 21002224170. Its totient is φ = 21002224168.

The previous prime is 21002224081. The next prime is 21002224213. The reversal of 21002224169 is 96142220012.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 18463374400 + 2538849769 = 135880^2 + 50387^2 .

It is a cyclic number.

It is not a de Polignac number, because 21002224169 - 2³² = 16707256873 is a prime.

It is a super-2 number, since 2×21002224169² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (21002224469) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10501112084 + 10501112085.

It is an arithmetic number, because the mean of its divisors is an integer number (10501112085).

Almost surely, 2^21002224169 is an apocalyptic number.

It is an amenable number.

21002224169 is a deficient number, since it is larger than the sum of its proper divisors (1).

21002224169 is an equidigital number, since it uses as much as digits as its factorization.

21002224169 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3456, while the sum is 29.

The spelling of 21002224169 in words is "twenty-one billion, two million, two hundred twenty-four thousand, one hundred sixty-nine".